CN111562497A - Method for detecting poor contact fault of generator stator bar connector - Google Patents

Method for detecting poor contact fault of generator stator bar connector Download PDF

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Publication number
CN111562497A
CN111562497A CN202010480826.8A CN202010480826A CN111562497A CN 111562497 A CN111562497 A CN 111562497A CN 202010480826 A CN202010480826 A CN 202010480826A CN 111562497 A CN111562497 A CN 111562497A
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temperature
stator bar
stator
maximum
bar
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CN111562497B (en
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张兴明
吴明波
吴涛
杨昶宇
孙卫
王江
邢志江
郗发刚
张宏
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Huaneng Lancang River Hydropower Co Ltd
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Huaneng Lancang River Hydropower Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract

The invention provides a method for detecting a fault of poor contact of a generator stator bar connector, which comprises the following steps: 1) setting various temperature values allowed by the running of the water turbine generator set; 2) acquiring various temperature values monitored by a computer system on line; 3) calculating the average temperature value of each stator bar; 4) finding out the maximum temperature of the stator bar and the maximum temperature of the stator core; 5) calculating a temperature deviation value of the stator bar; 6) calculating the maximum temperature difference between the stator bar and the stator core; 7) and (3) detecting the poor contact fault and the specific fault position of the stator bar joint after comparing the data set in the step (1). Effectively replace the artifical equipment of patrolling and examining in airtight, narrow and small space of power plant, through in time discovering the trouble, formulate the treatment measure, avoid taking place the equipment accident, improve the stability of unit operation, extension equipment life cycle provides reliable technical support for generator operation unit.

Description

Method for detecting poor contact fault of generator stator bar connector
Technical Field
The invention relates to a method for detecting a poor contact fault of a generator stator bar connector, in particular to a method for detecting a poor contact fault of a stator bar connector based on temperature deviation of a stator bar and temperature of a stator core, and belongs to the technical field of generator fault detection.
Background
The stator of the hydraulic generator mainly comprises a base, an iron core, a three-phase winding bar and the like, wherein the three-phase winding bar is embedded in a tooth slot of the iron core. The connection of the stator bar at the upper layer and the lower layer of the stator core, the connection of the interelectrode connecting wires and the connection of the outgoing lines are realized by the joints at the two ends of the stator bar. The number of the stator bar joints of the large-scale hydraulic generator reaches hundreds, and the current flowing through each joint is continuously increased along with the continuous increase of the capacity of a single machine, wherein the current is thousands of amperes in small and tens of thousands of amperes in large. The poor contact of the stator bar joints caused by the joint welding process, the material and the like can cause the resistance value and the current of each stator bar to be different, the joint temperature to be increased, the insulation to be reduced and the like, the unit protection tripping accidents such as the breakdown of the stator bar, the loosening of the joint and the like can be seriously caused, and the longer time is needed for the accident treatment caused by the poor joint of the stator bar. The space at the joint of the stator bar is closed and narrow, field workers are difficult to check one by one in daily routing inspection, and the fault of poor contact of the joint of the stator bar of the generator is difficult to find.
The prior art comprises the following steps: firstly, detecting the contact state of a joint through an ultrasonic transmitting device; secondly, the windings are connected in series during maintenance, a current injection test is carried out, and the temperature of each joint of the stator bar is measured to judge whether the joints are loosened. Whether the stator bar joint is more reliable through ultrasonic inspection, whether can effectively discover the joint in the insulating parcel contact well, nevertheless because large-scale generating set's stator bar joint has hundreds, and the space is airtight, narrow and small, and it is very difficult thing to carry out ultrasonic detection to every joint, not only will consume a large amount of time, can only detect when the unit is shut down or is overhauld moreover, consume the unit operation time and be exactly the benefit that reduces the power plant. The loosening of the joints is judged by the temperature of each joint in the current injection test in the overhaul period, and the loosening can be finished only in the overhaul period of the unit, and the test is performed only conditionally during overhaul. At present, no method for diagnosing and analyzing the contact state of the stator bar joint in real time according to the running state of a unit exists. Therefore, the method can detect the contact state of a plurality of stator bar joints of the generator in time, and is an important link for ensuring the normal operation of the generator.
Disclosure of Invention
In order to accurately diagnose the poor contact fault of the generator stator bar connector and avoid equipment halt caused by the poor contact fault of the stator bar, the invention detects the poor contact fault of the stator bar connector by acquiring the temperature values of the stator bar and the stator core in real time, can find the fault in time and make a disposal measure, improves the running stability of a unit and prolongs the service life of the equipment.
The invention is realized by the following technical scheme: a generator stator bar joint poor contact fault detection method is characterized by comprising the following steps:
(8) setting the maximum value of the normal temperature of each stator bar allowed by the running of the water-turbine generator set to be TIs justStator bar temperature deviation of TDeflectionThe maximum temperature difference between the stator bar and the stator core is TMaximum of；
(9) Acquiring temperature values of a stator bar and a stator core of each measuring point at a certain moment through an existing temperature sensor of the water-turbine generator set and a computer connected with the temperature sensor;
(10) calculating the average temperature value of each stator bar according to the temperature values of the stator bar and the stator core of each part obtained in the step (2) and according to the following formula:
Figure BDA0002517297190000031
in the formula (I), the compound is shown in the specification,
Figure BDA0002517297190000032
representing the mean value of the temperature, T, of the stator bars at each locationiRepresenting the temperature of each stator bar;
(11) finding out the maximum temperature value of the stator bar and the maximum temperature value of the stator core according to the temperature values of the stator bar and the stator core of each measuring point obtained in the step (2);
(12) calculating the temperature deviation value t of the stator bar according to the following formula according to the temperature average value and the temperature maximum value of the stator bar obtained in the steps (3) and (4)Deflection：
Figure BDA0002517297190000033
In the formula, tDeflectionIs the temperature deviation value of the stator bar, TMaximum wire rodIs the maximum value of the temperature of the stator bar,
Figure BDA0002517297190000034
is the temperature average of the stator bar;
(13) according to the maximum value of the temperature of the stator bar and the maximum value of the temperature of the stator core obtained in the step (4), calculating the maximum temperature difference t between the stator bar and the stator core according to the following formulaMaximum of：
tMaximum of＝TMaximum wire rod-TMaximum of iron core
(14) And (3) carrying out the following comparison according to the data obtained in the steps (3) to (6) and the data set in the step (1):
the maximum temperature value T of the stator bar obtained in the step (4)Maximum wire rodSet bar temperature value TIs just；
Obtaining the temperature deviation value t of the stator bar in the step (5)DeflectionSet bar temperature deviation TDeflection；
The maximum temperature difference t between the stator bar and the stator core obtained in the step (6)Maximum ofSetting the maximum temperature difference T between the stator bar and the stator coreMaximum of；
Checking the drawing of the apparatus and the apparatus, determining TMaximum wire rodThe measuring point is positioned at the joint of the upper end or the lower end of the stator bar;
and (3) detecting: the water turbine generator set has the fault of poor contact of the stator bar connector; obtaining the specific position of the fault of poor contact of the stator bar joint;
(8) and (5) according to the detection result of the step (7), making inspection measures in time and making a maintenance treatment plan.
The invention is based on the following principle:
when the unit normally operates, the bars converge when current flows through the lines, so that the temperature of the stator bar is slightly higher than that of the stator core, theoretically, the temperatures of the stator bars are basically equal, and the temperatures of the stator cores are basically equal.
(1) If the contact of the joint part of a certain stator wire rod is poor, the stator wire rod part generates heat seriously, the maximum temperature of the stator wire rod is increased (can reach more than 90 ℃), but the temperature change of other parts of the stator iron core and the stator wire rod is small.
(2) The temperature of the stator bar rises due to various reasons, such as unbalanced electromagnetic tension, overlarge stator vibration, stator core eddy current, corona of a generator, abnormal air cooling and the like, and the temperature of the whole or part of a measuring point of the stator bar and the stator core rises. In order to eliminate the temperature rise of the stator bar and the temperature rise of the stator core caused by other fault reasons, the temperature deviation of the stator bar (the maximum value of the temperature of the stator bar-the average value of the temperature of the stator bar) and the maximum temperature difference between the stator bar and the stator core (the maximum value of the temperature of the stator bar-the maximum value of the temperature of the stator core) are introduced to serve as judgment conditions. If the average temperature of the stator bar and the stator core caused by other faults is increased, the temperature deviation of the stator bar cannot be increased, and meanwhile, the maximum temperature difference between the stator bar and the stator core cannot be increased.
(3) When a fault occurs, the temperature of a single point at the upper end or the lower end of the stator bar is gradually increased, namely the maximum temperature value of the stator bar, the temperature deviation value of the stator bar and the maximum temperature difference value of the stator bar and the stator core are increased simultaneously.
Therefore, the fault detection method can judge whether the stator bar joint poor contact fault exists by calculating the three monitoring values, and nearly two hundred temperature measuring points do not need to be detected and analyzed.
The invention has the following advantages and effects: through real-time collection stator bar and stator core temperature value, detect stator bar joint bad contact trouble, can in time discover trouble and fault location, effectively replace the manual work of power plant in airtight, narrow and small space equipment of patrolling and examining, through in time discovering the trouble, formulate the disposition measure, avoid taking place the equipment accident, improve the stability of unit operation, extension equipment life cycle, for the power plant operation unit stator bar joint contact state provides reliable technical support, fine practical meaning and spreading value have.
Accidents caused by poor contact of the stator bar connector of the generator are major accidents of a power plant, so that the good contact of each stator bar connector is guaranteed, and the key for guaranteeing the normal operation of a generating set of the power plant is realized.
Drawings
FIG. 1 is a schematic diagram of a generator stator structure;
fig. 2 is a flow chart of the fault detection of poor contact of the stator bar joint.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
In the embodiment, the practical detection is carried out by taking the running condition of the unit No. 1 of the hydraulic generator in a certain power plant as an example, 144 measuring points are arranged on a stator bar of the generator, and 54 measuring points are arranged on a stator iron core. The detection is carried out according to the following steps:
(1) setting the maximum value of the normal temperature of each stator bar allowed by the running of the water-turbine generator set to be TIs just80 deg.C, stator bar temperature deviation is TDeflectionMaximum temperature of stator bar and stator core at 25 deg.CThe difference is TMaximum of＝30℃；
(2) The temperature values of stator bars and a stator core at each part at a certain moment are obtained through an existing temperature sensor of the water-turbine generator set and a computer connected with the temperature sensor, the number of the stator bars is 144, and the number of the stator bars is 54. Because of more data measuring points, the data calculation related to the analysis method is carried out by means of an Excel table formula. Stator bar temperatures No. 1-144 are as in table 1 and stator core temperatures No. 1-54 are as in table 2.
TABLE 1
Figure BDA0002517297190000061
Figure BDA0002517297190000071
TABLE 2
Figure BDA0002517297190000072
(3) Calculating the average temperature value of each stator bar according to the temperature values of the stator bar and the stator core of each part obtained in the step (2) and according to the following formula:
Figure BDA0002517297190000073
in the formula (I), the compound is shown in the specification,
Figure BDA0002517297190000074
representing the mean value of the temperature, T, of the stator bars at each locationiRepresenting the temperature of each stator bar; the following formula is entered in the Excel table:
＝AVERAGE(A1:A144)
the average temperature of the stator bar is calculated as follows: 57.75 ℃.
(4) According to the temperature values of the stator bar and the stator core of each part obtained in the step (2), the maximum temperature value of the stator bar is No. 61 and 91.2 ℃, and the maximum temperature value of the stator core is No. 4 and 55.9 ℃;
(5) calculating the temperature deviation value t of the stator bar according to the following formula according to the temperature average value and the temperature maximum value of the stator bar obtained in the steps (3) and (4)Deflection：
Figure BDA0002517297190000081
In the formula, tDeflectionFor stator bar temperature deviation, TMaximum wire rodIs the maximum temperature of the stator bar,
Figure BDA0002517297190000082
is the average temperature of the stator bars.
(6) According to the maximum temperature of the stator bar and the maximum temperature of the stator core obtained in the step (4), calculating the maximum temperature difference t between the stator bar and the stator core according to the following formulaMaximum of：
tMaximum of＝TMaximum wire rod-TMaximum of iron core＝91.2-55.9＝35.3℃
(7) And (3) carrying out the following comparison according to the data obtained in the steps (3) to (6) and the data set in the step (1):
the maximum temperature value T of the stator bar obtained in the step (4)Maximum wire rod91.2 ℃ set > allowed stator bar temperature value TIs just＝80℃；
Obtaining the temperature deviation value t of the stator bar in the step (5)Deflection33.45 ℃ set allowable stator bar temperature deviation TDeflection＝25℃；
The maximum temperature difference t between the stator bar and the stator core obtained in the step (6)Maximum of35.3 ℃ is higher than the set allowable maximum temperature difference between the stator bar and the stator core is TMaximum of＝30℃；
Checking equipment drawing and equipment, determining No. 61TMaximum wire rodA measuring point of 91.2 ℃ is positioned at a joint at the lower end of the stator bar;
and (3) detecting: the water turbine generator set has the fault of poor contact of the stator bar connector; meanwhile, the specific position of the fault of poor contact of the stator bar connector is located at the connector at the lower end of No. 61 stator bar;
(8) according to the detection result of the step (7), the power plant makes a check measure in time, the power plant further confirms in situ that the fault of poor contact of No. 61 joint really exists, and the power plant performs repair welding and insulation wrapping treatment on the joint again;
(9) after processing, 144 stator bars and 54 stator core temperatures were again obtained from the computer for service as in tables 3, 4:
TABLE 3
Figure BDA0002517297190000091
TABLE 4
Figure BDA0002517297190000092
Figure BDA0002517297190000101
(8) According to the temperature values of the stator bar and the stator core of each part obtained in the step (9), calculating to obtain the average temperature of the stator bar as follows: 57.89 ℃.
(9) According to the temperature values of the stator bar and the stator core of each part obtained in the step (9), the maximum temperature values of the stator bar are found to be No. 16 and No. 82, the maximum temperature value of the stator core is No. 41 and No. 56.0 ℃;
(10) calculating the temperature deviation value t of the stator bar according to the temperature average value and the temperature maximum value of the stator bar obtained in the steps (10) and (11)Deflection＝4.01℃：
(11) According to the maximum temperature of the stator bar and the maximum temperature of the stator core obtained in the step (11), calculating the maximum temperature difference t between the stator bar and the stator core according to the following formulaMaximum of＝5.9℃：
The maximum temperature value T of the stator bar is detected again after the overhaul treatmentMaximum wire rod61.9 ℃ is far less than the allowed temperature T of the stator barIs justThe temperature is 80 ℃; temperature deviation value t of stator barDeflection4.01 ℃ is far less than the allowable stator bar temperature deviation TDeflectionSetting the temperature at 25 ℃; maximum temperature difference t between stator bar and stator coreMaximum ofThe maximum temperature difference between the stator bar and the stator core is T which is far less than the allowable temperature difference at 5.9 DEG CMaximum of30 ℃, and the maximum temperature of the stator bar before failure is No. 4, No. 4 is not maximum after treatment. The method is proved to be effective, accurate and reliable in judging the fault of poor contact of the stator bar joint by detecting the temperature deviation of the stator bar, the maximum temperature difference between the stator bar and the stator core and the maximum temperature of the stator bar.
Example 2
The method is characterized in that the practical detection is carried out by taking the running condition of a No. 3 unit of a hydraulic generator of a certain power plant as an example, 144 measuring points are arranged on a stator bar of the generator, 54 measuring points are arranged on a stator iron core, and the detection is carried out according to the following steps:
(1) setting the maximum value of the normal temperature of each stator bar allowed by the running of the water-turbine generator set to be TIs just80 deg.C, stator bar temperature deviation is TDeflectionThe maximum temperature difference between the stator bar and the stator core is T at 25 DEG CMaximum of＝30℃；
(2) The temperature values of stator bars and a stator core at each part at a certain moment are obtained through an existing temperature sensor of the water-turbine generator set and a computer connected with the temperature sensor, the number of the stator bars is 144, and the number of the stator bars is 54. Because of more data measuring points, the data calculation related to the analysis method is carried out by means of an Excel table formula. Stator bar temperatures No. 1-144 are as in table 5 and stator core temperatures No. 1-54 are as in table 6.
TABLE 5
Figure BDA0002517297190000111
Figure BDA0002517297190000121
TABLE 6
Figure BDA0002517297190000122
(3) Calculating the average temperature value of each stator bar according to the temperature values of the stator bar and the stator core of each part obtained in the step (2) and according to the following formula:
Figure BDA0002517297190000123
in the formula (I), the compound is shown in the specification,
Figure BDA0002517297190000124
representing the mean value of the temperature, T, of the stator bars at each locationiRepresenting the temperature of each stator bar; the following formula is entered in the Excel table:
＝AVERAGE(A1:A144)
the average temperature of the stator bar is calculated as follows: 65.43 ℃.
(4) According to the temperature values of the stator bar and the stator core of each part obtained in the step (2), the maximum temperature value of the stator bar is 30-90.8 ℃, and the maximum temperature value of the stator core is 20-85.8 ℃;
(5) calculating the temperature deviation value t of the stator bar according to the following formula according to the temperature average value and the temperature maximum value of the stator bar obtained in the steps (3) and (4)Deflection：
Figure BDA0002517297190000131
In the formula, tDeflectionFor stator bar temperature deviation, TMaximum wire rodIs the maximum temperature of the stator bar,
Figure BDA0002517297190000132
is the average temperature of the stator bars.
(6) According to the maximum temperature of the stator bar and the maximum temperature of the stator core obtained in the step (4), calculating the maximum temperature difference t between the stator bar and the stator core according to the following formulaMaximum of：
tMaximum of＝TMaximum wire rod-TMaximum of iron core＝90.1-85.8＝4.3℃
(7) And (3) carrying out the following comparison on the data obtained in the steps (3) to (6) and the data set in the step (1):
the maximum temperature value T of the stator bar obtained in the step (4)Maximum wire rod90.1 ℃ > set allowable stator bar temperature value TIs just＝80℃；
Obtaining the temperature deviation value t of the stator bar in the step (5)Deflection25.43 ℃ set allowable stator bar temperature deviation TDeflection＝25℃；
The maximum temperature difference t between the stator bar and the stator core obtained in the step (6)Maximum of4.3 ℃ < maximum temperature difference between stator bar and stator core set to be allowed is TMaximum of＝30℃；
(8) The temperature rise of the stator bar is caused by a plurality of reasons, and according to the method disclosed by the invention, if poor contact of the stator bar joint exists, the following conditions are required to be met: t isMaximum wire rod＞TIs just，tDeflection＞TDeflection，tMaximum of＞TMaximum ofHowever, the detection result of the embodiment 2 only meets two conditions, and the power plant further checks the generator to determine that the generator is a local corona serious fault, which shows that the fault of poor contact of the stator bar joint can be eliminated according to the method of the invention.
Example 3
The practical detection is carried out by taking the running condition of the unit No. 4 of the hydraulic generator of a certain power plant as an example, 144 measuring points are arranged on a stator bar of the generator, and 54 measuring points are arranged on a stator iron core. The detection is carried out according to the following steps:
(1) setting the maximum value of the normal temperature of each stator bar allowed by the running of the water-turbine generator set to be TIs just80 deg.C, stator bar temperature deviation is TDeflectionThe maximum temperature difference between the stator bar and the stator core is T at 25 DEG CMaximum of＝30℃；
(2) The temperature values of stator bars and a stator core at each part at a certain moment are obtained through an existing temperature sensor of the water-turbine generator set and a computer connected with the temperature sensor, the number of the stator bars is 144, and the number of the stator bars is 54. Because of more data measuring points, the data calculation related to the analysis method is carried out by means of an Excel table formula. Stator bar temperatures No. 1-144 are as in table 7 and stator core temperatures No. 1-54 are as in table 8.
TABLE 7
Figure BDA0002517297190000141
Figure BDA0002517297190000151
TABLE 8
Figure BDA0002517297190000152
(3) Calculating the average temperature value of each stator bar according to the temperature values of the stator bar and the stator core of each part obtained in the step (2) and according to the following formula:
Figure BDA0002517297190000153
in the formula (I), the compound is shown in the specification,
Figure BDA0002517297190000154
representing the mean value of the temperature, T, of the stator bars at each locationiRepresenting the temperature of each stator bar; the following formula is entered in the Excel table:
＝AVERAGE(A1:A144)
the average temperature of the stator bar is calculated as follows: 76.0 ℃.
(4) According to the temperature values of the stator bar and the stator core of each part obtained in the step (2), the maximum temperature value of the stator bar is No. 143, 81.8 ℃ and the maximum temperature value of the stator core is No. 48, 77.3 ℃;
(5) calculating the temperature deviation value t of the stator bar according to the following formula according to the temperature average value and the temperature maximum value of the stator bar obtained in the steps (3) and (4)Deflection：
Figure BDA0002517297190000161
In the formula, tDeflectionFor stator bar temperature deviation, TMaximum wire rodIs the maximum temperature of the stator bar,
Figure BDA0002517297190000162
is the average temperature of the stator bars.
(6) According to the maximum temperature of the stator bar and the maximum temperature of the stator core obtained in the step (4), calculating the maximum temperature difference t between the stator bar and the stator core according to the following formulaMaximum of：
tMaximum of＝TMaximum wire rod-TMaximum of iron core＝81.8-77.3＝4.5℃
(7) And (3) carrying out the following comparison on the data obtained in the steps (3) to (6) and the data set in the step (1):
the maximum temperature value T of the stator bar obtained in the step (4)Maximum wire rod81.8 ℃ setting the permissible stator bar temperature value TIs just＝80℃；
Obtaining the temperature deviation value t of the stator bar in the step (5)Deflection5.8 ℃ < set allowable stator bar temperature deviation TDeflection＝25℃；
The maximum temperature difference t between the stator bar and the stator core obtained in the step (6)Maximum of4.5 ℃ < maximum temperature difference between stator bar and stator core set as allowed is TMaximum of＝30℃；
(8) The fault causes that the temperature of the stator bar rises are many, and according to the detection of the principle of the method, if the stator bar joint has poor contact, the following conditions are required to be met: t isMaximum wire rod＞TIs just，tDeflection＞TDeflection，tMaximum of＞TMaximum ofHowever, the detection result of the embodiment 3 only meets a condition, which indicates that the fault is not a poor contact fault of the stator bar joint, and the power plant further checks the generator to determine that the flow of the cooling water of the air cooler is too low, so that the cooling of the generator is abnormal.
Through the three embodiments, the method is proved that the temperature of the stator bar of the generator is higher than the set allowable temperature of the stator bar due to a plurality of fault reasons of the temperature rise of the stator bar, the maximum temperature of the stator bar, the temperature deviation of the stator bar and the maximum temperature difference between the stator bar and a stator core are detected through the method, and when the three monitoring quantities are higher than the set allowable values, the existence of the fault of poor contact of the stator bar connector is proved, so that the method is really effective, accurate and reliable.

Claims (1)

1. A generator stator bar joint poor contact fault detection method is characterized by comprising the following steps:
(1) setting the maximum value of the normal temperature of each stator bar allowed by the running of the water-turbine generator set to be TIs justStator bar temperature deviation of TDeflectionThe maximum temperature difference between the stator bar and the stator core is TMaximum of；
(2) Acquiring temperature values of a stator bar and a stator core of each measuring point at a certain moment through an existing temperature sensor of the water-turbine generator set and a computer connected with the temperature sensor;
(3) calculating the average temperature value of each stator bar according to the temperature values of the stator bar and the stator core of each part obtained in the step (2) and according to the following formula:
Figure FDA0002517297180000011
in the formula (I), the compound is shown in the specification,
Figure FDA0002517297180000012
representing the mean value of the temperature, T, of the stator bars at each locationiRepresenting the temperature of each stator bar;
(4) finding out the maximum temperature value of the stator bar and the maximum temperature value of the stator core according to the temperature values of the stator bar and the stator core of each measuring point obtained in the step (2);
(5) calculating the temperature deviation value t of the stator bar according to the following formula according to the temperature average value and the temperature maximum value of the stator bar obtained in the steps (3) and (4)Deflection：
Figure FDA0002517297180000013
In the formula, tDeflectionIs the temperature deviation value of the stator bar, TMaximum wire rodThe maximum value of the temperature of the stator bar, T is the average value of the temperature of the stator bar;
(6) according to the maximum value of the temperature of the stator bar and the maximum value of the temperature of the stator core obtained in the step (4), calculating the maximum temperature difference t between the stator bar and the stator core according to the following formulaMaximum of：
tMaximum of＝TMaximum wire rod-TMaximum of iron core
(7) And (3) carrying out the following comparison according to the data obtained in the steps (3) to (6) and the data set in the step (1):
71) the maximum temperature value T of the stator bar obtained in the step (4)Maximum wire rodSet bar temperature value TIs just；
72) Obtaining the temperature deviation value t of the stator bar in the step (5)DeflectionSet bar temperature deviation TDeflection；
73) The maximum temperature difference t between the stator bar and the stator core obtained in the step (6)Maximum ofSetting the maximum temperature difference T between the stator bar and the stator coreMaximum of；
74) Checking the drawing of the apparatus and the apparatus, determining TMaximum wire rodThe measuring point is positioned at the joint of the upper end or the lower end of the stator bar;
and (3) detecting: the water turbine generator set has the fault of poor contact of the stator bar connector; obtaining the specific position of the fault of poor contact of the stator bar joint;
(8) and (5) according to the detection result of the step (7), making inspection measures in time and making a maintenance treatment plan.
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